Abstract
Demand theory describes and explains individual choice of consumption bundles. Traditional theory considers optimizing behaviour when the consumer’s choice is restricted to consumption bundles that satisfy a budget constraint. The budget constraint is determined by price–income pairs. A demand correspondence assigns to each price–income pair a non-empty set of optimal consumption bundles. A demand function assigns to each price–income pair a unique optimal consumption bundle. Optimality of consumption bundles is based on a preference relation. The theory derives existence and properties of demand correspondences (demand functions) from assumptions on preference relations and, if applicable, their utility representations.
Published Version
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